The nervous system - peripheral nervous system - ch 12 Flashcards

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1
Q

Explain the main role of the peripheral nervous system?

A

To act as a communicator channel between the CNS and the body’s organs, glands and muscles and to sensory receptors in the limbs and the skin.

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2
Q

What two systems can the peripheral nervous system be divided into?

A
  1. somatic nervous system

2. autonomic nervous system

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3
Q

What does the somatic nervous system transmit?

A

communications relating to the senses

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4
Q

What is the somatic nervous system responsible for?

A

Managing voluntary body movements

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5
Q

What does the somatic nervous system consist of?

A
  1. 31 pairs of spinal nerves

2. 12 pairs of cranial nerves

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6
Q

Describe the role of the spinal nerves?

A

spinal nerves carry sensory impulses into and motor impulses out of the spinal cord.

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7
Q

How are spinal nerves named?

A

According to the vertebrae they are associated with

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8
Q

How many pairs of cervical nerves?

A

8 pairs

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9
Q

How many pairs of thoracic nerves?

A

12 pairs

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10
Q

How many pairs of lumbar nerves?

A

5 pairs

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11
Q

How many pairs of cervical nerves?

A

5 pairs

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12
Q

How many pairs of coccygeal nerves?

A

1 pair

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13
Q

Where do the nerves branch off from?

A

the spinal cord into the thorax, abdomen and extremities

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14
Q

What is the role of the cranial nerves?

A

to carry impulses into and out of the cerebrum or brain stem

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15
Q

Which nerves are named according to their function or structure and are designated by the roman numerals I-XII.

A

cranial nerves

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16
Q

Cranial nerves are associated with?….

A
  1. senses of smells
  2. sight
  3. hearing
  4. taste
  5. movement of eye muscles and tongue
  6. movement of muscles that control facial expression and chewing
17
Q

The autonomic nervous system directs involuntary body functions; name the functions?

A
  1. respiration
  2. digestion
  3. urine production
  4. heartbeat
  5. blood pressure
18
Q

What is the role of the autonomic nervous system?

A
  1. Creates emotional responses such as sweating and crying.

2. monitors internal bodily activities

19
Q

What does the anatonomic nervous system do with the information gained from monitoring internal bodily activities?

A

ANS integrates it into the brain and then in response the ANS sends commands to involuntary smooth muscle in organs, glands and blood vessels.

20
Q

Name two subsystems that the ANS has?

A
  1. sympathetic nervous system

2. parasympathetic nervous system

21
Q

What is the role of the sympathetic nervous system?

A

SNS manages the bodys reaction to stress and emergencies

22
Q

What happens when the SNS is activated?

A
  1. heart and breathing rate increases
  2. digestion slows or stops
  3. pupils dialate
  4. body begins to sweat
23
Q

When the SNS is activated what is it called when the SNS responds and works to prepare the body to either fight danger or flee from it?

A

fight or flight response

24
Q

What is the role of the parasympathetic nervous system?

A

to counteract the functions of the sympathetic nervous system

25
Q

What action does the parasympathetic nervous system take when it counteracts the sympathetic nervous system?

A
  1. calms the body after the danger has passed
  2. heart and breathing returns to normal
  3. digestion resumes
  4. pupils contract
  5. sweating stops